iridium plug heat differances?
Mar 25, 2004 | 10:08 AM
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iridium plug heat differances?
anyone know the differance between 7-8-9 heat grading on the irid plugs? thanx in advance.mark
Mar 25, 2004 | 01:21 PM
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The higher the number the colder the plug.
The more modified the car, usually the colder the plug you need.
7s or 8s are best on a car that is fairly well modded.
Rich
Mar 25, 2004 | 07:03 PM
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thanx
thanx rich. regards.mark
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